GENERAL HISTOLOGY

Detailed explanation-1: -When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%.

Detailed explanation-2: -This phenomenon, also known as the anomalous expansion of water is the reason why water bottles crack on freezing of the water inside. Another effect of this is the floating of ice cubes in water. It is because ice is of lesser density than water due to the reason mentioned above.

Detailed explanation-3: -Water expands when it becomes ice, and since the volume is inversely proportional to the density of a substance, ice is less dense than water. For this reason, ice, a substance that appears heavier than its liquid form, floats on water. If water didn’t expand when it froze, then ice would be denser than water.